source: trip-planner-front/node_modules/once/once.js@ bdd6491

Last change on this file since bdd6491 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 935 bytes
Line 
1var wrappy = require('wrappy')
2module.exports = wrappy(once)
3module.exports.strict = wrappy(onceStrict)
4
5once.proto = once(function () {
6 Object.defineProperty(Function.prototype, 'once', {
7 value: function () {
8 return once(this)
9 },
10 configurable: true
11 })
12
13 Object.defineProperty(Function.prototype, 'onceStrict', {
14 value: function () {
15 return onceStrict(this)
16 },
17 configurable: true
18 })
19})
20
21function once (fn) {
22 var f = function () {
23 if (f.called) return f.value
24 f.called = true
25 return f.value = fn.apply(this, arguments)
26 }
27 f.called = false
28 return f
29}
30
31function onceStrict (fn) {
32 var f = function () {
33 if (f.called)
34 throw new Error(f.onceError)
35 f.called = true
36 return f.value = fn.apply(this, arguments)
37 }
38 var name = fn.name || 'Function wrapped with `once`'
39 f.onceError = name + " shouldn't be called more than once"
40 f.called = false
41 return f
42}
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